linux-kernel - Re: [PATCH RFC net-next 18/19] net: mvpp2: add ring size validation before enabling FC

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Message-ID: <X/s7dFGDvoZzvKEN@lunn.ch>
Date:   Sun, 10 Jan 2021 18:37:56 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     stefanc@...vell.com
Cc:     netdev@...r.kernel.org, thomas.petazzoni@...tlin.com,
        davem@...emloft.net, nadavh@...vell.com, ymarkman@...vell.com,
        linux-kernel@...r.kernel.org, kuba@...nel.org,
        linux@...linux.org.uk, mw@...ihalf.com, rmk+kernel@...linux.org.uk,
        atenart@...nel.org
Subject: Re: [PATCH RFC net-next  18/19] net: mvpp2: add ring size validation
 before enabling FC

On Sun, Jan 10, 2021 at 05:30:22PM +0200, stefanc@...vell.com wrote:
> From: Stefan Chulski <stefanc@...vell.com>
> 
> This patch add ring size validation before enabling FC.
> 1. Flow control cannot be enabled if ring size is below start
> threshold.
> 2. Flow control disabled if ring size set below start
> threshold.

You should also tell phylink if pause is not supported, so it can
change what is auto-negotiated, letting the link partner know.

       Andrew